So here's what you do. You think "what a ****ing moron" and then you move on. You do not *ban them* from giving their opinion. This forum is not entitled to anyone.
If everyone thinks its stupid then why do you think anyone would take their opinion into consideration? It just wont go any further than them posting it, which they have every right to do.
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Just explain to them why they're wrong, or ignore them, but you can't silence them.